Freddy-wak broke down compu box perfectly a few years ago in one of his youtube videos. It's by no means an objective tally of what really happened in a fight.
Some days their good, like when its two real nobodies, or at least not "politically" connected fighters fighting. And other days, like this one the numbers are shifted to fit the HBO agenda which was Pacquiao is our guy and we will make him look good no matter what.
It (they) also registers a point every time Pac hits air. Like I've said many times, if HBO wanted compu-box to be accurate, there are several simple ways to achieve this, but they very obviously don't care. It's just a PR tool to help them push their agenda for any given fight.